98 dodge ram 2500 hasn't been driven in awhile until a couple weeks ago. no heat at all replaced thermostat had some heat . now it works with selector in between hot and cold then finally stopped . blows cold air only. need help

 

I have the same problem with my 97. You might try flushing the heater core...

I havent had the time to do anything but pull heater core and have i checked out.. It was fine... Im guessing that one of the vaccum solenoids that control mixing outside air isnt working correctly...

 

thanks. i really don't know sh*t about all that stuff lol. where do i find those?

 

You can find the info in the FAQ/DIY section. There is a service manual you can download for free.

 

ok thanks

 

You can check cable and blend door operation in the manner.